Humboldt State University ® Department of Chemistry

Richard A. Paselk

Chem 109 - General Chemistry - Spring 2011

Lecture Notes 17: 28 February

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Thermochemistry

Energy

Law of Conservation of Energy

Energy can be transformed, but is neither created nor destroyed in chemical processes. Thus radiant energy can be transformed into heat which may to used to expand the volume of a gas and vice versa, bond energy can be converted into heat and/or light, etc.

Problem here of course is- What is energy? Energy is the capacity to do work. So what's work? Work occurs when an object (mass) is moved against a force. Some common forms of energy important to our study include:

 

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© R A Paselk

Last modified 28 February 2011